memory - FreeRTOS 应用程序的长 gdb 回溯是堆栈溢出的标志吗？

Question

我正在为一个项目使用 FreeRTOS，并尝试使用 gdb 和 JLinkGDBServer 对其进行调试。我的问题是，当我停止执行并进行回溯时，我一行接一行地得到:

#192 0x08005a88 in pxPortInitialiseStack (pxTopOfStack=0xa5a5a5a5, pxCode=0xa5a5a5a5, 
    pvParameters=0xa5a5a5a5)
    at /home/username/storage/repos/project/third_party/freertos/portable/GCC/ARM_CM3/port.c:231
#193 0x08005a88 in pxPortInitialiseStack (pxTopOfStack=0xa5a5a5a5, pxCode=0xa5a5a5a5, 
    pvParameters=0xa5a5a5a5)
    at /home/username/storage/repos/project/third_party/freertos/portable/GCC/ARM_CM3/port.c:231
#194 0x08005a88 in pxPortInitialiseStack (pxTopOfStack=0xa5a5a5a5, pxCode=0xa5a5a5a5, 
    pvParameters=0xa5a5a5a5)
    at /home/username/storage/repos/project/third_party/freertos/portable/GCC/ARM_CM3/port.c:231
#195 0x08005a88 in pxPortInitialiseStack (pxTopOfStack=0xa5a5a5a5, pxCode=0xa5a5a5a5, 
    pvParameters=0xa5a5a5a5)
    at /home/username/storage/repos/project/third_party/freertos/portable/GCC/ARM_CM3/port.c:231
#196 0x08005a88 in pxPortInitialiseStack (pxTopOfStack=0xa5a5a5a5, pxCode=0xa5a5a5a5, 
    pvParameters=0xa5a5a5a5)
    at /home/username/storage/repos/project/third_party/freertos/portable/GCC/ARM_CM3/port.c:231
#197 0x08005a88 in pxPortInitialiseStack (pxTopOfStack=0xa5a5a5a5, pxCode=0xa5a5a5a5, 
    pvParameters=0xa5a5a5a5)
    at /home/username/storage/repos/project/third_party/freertos/portable/GCC/ARM_CM3/port.c:231

这是堆栈溢出的迹象还是什么？我在我的 FreeRTOSConfig.h 中使用 configCHECK_FOR_STACK_OVERFLOW 2 检查堆栈溢出

Answer 1

是的——这是因为 GDB 不知道什么时候停止展开状态。或者换句话说，它不知道何时到达任务堆栈帧的末尾。

默认情况下，堆栈帧的末尾会将任务留在错误函数中，因为您不应该在不删除任务的情况下从任务返回，但错误函数本身不会返回任何地方。在大多数情况下，对于大多数调试器来说这很好，但有时 GDB 可能有点热情，并且提供了 configTASK_RETURN_ADDRESS 常量以允许您用简单的 NULL 替换错误函数的地址 - GDB 不会尝试进一步展开.

为了将来引用，如果您想了解堆栈溢出，请阅读 FreeRTOS.org 网站上的堆栈溢出检测页面:http://www.freertos.org/Stacks-and-stack-overflow-checking.html